Hi Jdavenport,
It would be helpful to have a few more pictures fron slightly further away and a photo of he whole shell. A critical thing: Is this a full length FlipPac or one that has an overhang over the cab? If it has an overhang you may well be concerned as I have seen that style fail (pictures of anyway) due to the rusting out of the entire support bar inside the fiberglass. If you have the full length style I would not be as concerned because the shell itself supports the internal tubing much better. It would have to be REALLY rusted in this style to fail.
I would make sure the hinge bolts are tight - there are three on each hinge inside the shell - you have to open it to gain access.
Word of caution: If the bolts are frozen you can sheer them off and open up a whole can of worms. I recently had to cut a 1" hole in the opposite end of the shell that I'm repairing and use a 7 foot long "punch" to get a broken hinge out... I needed to remove the hinge anyway, but one of the three bolts sheared off. Not very encouraging I know. Use caution and maybe work the bolt loose/tight/lose/tight until you are sure it is moving and not just twisting and about to break...
As you will find out the FlipPac is a great idea, but not executed in the best of ways... they have many flaws, but there is nothing else out there (in my opinion) that fills these shoes. I love mine and will continue to use it as long as I can keep it together
CJS